Pain in your arms is a common symptom with many different causes, from arthritis and overuse injuries like tendonitis to a heart attack.

The 25-year-old went back into the operating room, and doctors cut open his arm to check on the thumb bone hiding inside, according to the report. To their relief, the bone was still alive.

Our ancestors were making tools out of bones 1.5 million years ago, winding back the clock for this important moment in human evolution by more than a million years, a study said Wednesday.

From your shoulders to your fingers, your arms have many moving parts: joints, bones, muscles, nerves, tendons and ligaments. Mysterious arm pain that seemingly comes out of nowhere can arise if ...